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首页> 外文期刊>Marine biology >Introgressive hybridization between the Atlantic and Pacific herrings (Clupea harengus and C. pallasii) in the north of Europe
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Introgressive hybridization between the Atlantic and Pacific herrings (Clupea harengus and C. pallasii) in the north of Europe

机译：欧洲北部大西洋和太平洋鲱鱼（Clupea harengus和C. pallasii）之间的渗入杂交

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摘要

We present evidence of mitochondrial and nuclear introgression from the Atlantic herring Clupea harengus into the Pacific herring C. pallasii in northern European seas, where the two species have come into secondary contact following the post-glacial trans-Arctic invasion of Pacific herring to the Atlantic realm. Although the breeding areas of the two species are thought to be separate, 7 % of the resident Pacific herring in samples from the White Sea were found to possess Atlantic herring mitochondria. The percentage was even higher (21 %) in the local Balsfjord stock of the Norwegian Sea, whereas it was nil in Pechora Sea samples. Similar or somewhat lower levels of genomic admixture were estimated from four diagnostic or nearly diagnostic nuclear allozyme loci. The absences of inter-locus and cytonuclear disequilibria, together with the patterns of mtDNA haplotype diversity, suggest recurrent backcrossing and hybridization over a long period in the post-glacial time frame. From a reassessment of published allozyme data, a hypothesis is presented that the patterns of intra-species geographical variation previously recorded in North European herrings may largely reflect varying levels of introgression. The study presents new information on the processes that affect the genetic structure of one of the most abundant fishes of the northern seas. It also adds to the knowledge on the occurrence of inter-species gene flow in marine fishes and on the consequences of trans-Arctic biotic invasions in general.
机译：我们提供了从大西洋鲱的Clupea harengus到欧洲北部太平洋的太平洋鲱C.pallasii的线粒体和核渗入的证据，这两个物种在冰河后跨大西洋入侵太平洋鲱到大西洋之后已经进行了二次接触领域。尽管两个物种的繁殖区被认为是分开的，但发现白海样本中有7％的太平洋鲱鱼拥有大西洋鲱鱼线粒体。在挪威海的Balsfjord本地种群中，这一百分比甚至更高（21％），而在Pechora Sea样本中则为零。从四个诊断或接近诊断的核同工酶基因座估计出相似或较低水平的基因组混合物。基因座间和细胞核不平衡的缺乏，以及mtDNA单倍型多样性的模式，表明在冰川后的时间框架内长期反复回交和杂交。通过重新评估已发布的同工酶数据，提出了一个假设，即以前在北欧鲱鱼中记录的物种内部地理变异的模式可能在很大程度上反映了不同程度的渗入。该研究提供了有关影响北海最丰富的鱼类之一的遗传结构的过程的新信息。它也增加了有关海洋鱼类中种间基因流动的发生以及一般情况下跨北极生物入侵的后果的知识。

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  • 来源
    《Marine biology》 |2015年第1期|39-54|共16页
  • 作者

    Hanna M. Laakkonen; Petr Strelkov; Dmitry L. Lajus; Risto Vaeinoelae;

  • 作者单位

    Finnish Museum of Natural History, University of Helsinki, POB 17, 00014 Helsinki, Finland;

    Department of Ichthyology and Hydrobiology, St. Petersburg State University, 16 Line, 29, Vasilevsky Island, Saint Petersburg 199178, Russia;

    Department of Ichthyology and Hydrobiology, St. Petersburg State University, 16 Line, 29, Vasilevsky Island, Saint Petersburg 199178, Russia;

    Finnish Museum of Natural History, University of Helsinki, POB 17, 00014 Helsinki, Finland;

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